Résumé:
The combination of co-electropolymerization and molecularly imprinting technology
provides functional materials with improved properties and can enhance the number of
binding sitesthan the individual monomer. In this work, molecularly imprinted poly (anilineco-3,4-ethylenedioxy-thiophene) MI-P(AnEDOT) composite thin film was synthesized on
gold electrode by using an in-situ co-electropolymerization method using salicylamide
(SMD) as a template. The formation of the thin film was monitored and characterized by
electrochemical methods; SWV and CV. Solvent extraction of the template generated the
binding cavities in the polymer matrix which fit the target in size, shape and functionality.
After the rebinding of SMD, the novel sensor shows a linear range between 2 × 10-6
to 1 ×
68.5 ppm, limit of detection (LOD) of 7.88 × 10-6 ppm. The composite film showed high
affinity towards SMD through multiple noncovalent interactions, good stability and
reproducibility with RSD 2.1 %. The developed sensor has an interesting potential for real
sample testing applications with good RSD of 6.01 % and a LOD of 9.29 × 10-6 ppm. The
new sensing composite material has great sensitivity and selectivity due to the synergistic
effects of multi-functionality from the two polymers, porous thin film and imprinting effect.
To this end, the MI-P(AnEDOT) can be regarded as a potential functional material for the
chemical sensor development in future.
